SPTB and metabolic dysfunction-associated steatotic liver disease: Consistently, among the NAFLD subjects, AST levels were significantly increased from 26.20 ± 34.51 U L−1 in FTB subjects to 39.72 ± 53.44 U L−1 in sPTB (p = 7.8 × 10−4) and 47.13 ± 59.14 U L−1 in iPTB subjects (p = 10−9) (Supplementary Fig. 3d).